I built a very versatile grinder/buffer from a set of 3/4" pillow blocks, a length of drill rod and a 3/4 HP electric motor. One end of the shaft is turned down to 1/2" diameter and threaded for 1/2-20 screw-on arbors for a wire wheel, and muslin or felt buffing wheels, while the other end has a 1/2" left-hand thread for attaching a grinding wheel. The motor has a 3-step pulley and a drive belt for spinning the shaft at different speeds. Turning the LH thread on my lathe was quite a learning experience! The whole works is mounted to a steel plate with a tripod leg arrangement for stability.
Jerry

"It is better to be silent and be thought a fool than to speak and eliminate all doubt!" - Abraham Lincoln
Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt!
There is nothing noble in being superior to your fellow man; true nobility is being superior to your former self. - Ernest Hemingway
Love your enemies and drive 'em nuts!